Go back thru the IA interview again.
On the IA menu page, it is contained in the "Adjustments" section...start in thru there again, and on one of the pages is one called "Do You Have Any Personal Adjustments"....and there is a whole big list under it that includes:
" College Savings Iowa, or Iowa Advisor 529 Plan"
You need to say YES on that page.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*